title: Some aspects of research on chronic bronchitis in China.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001688:Biological Products / Q000627:therapeutic use; D001991:Bronchitis / Q000175:diagnosis / Q000628:therapy*; D001999:Bronchoscopy; D005260:Female; D005336:Fiber Optic Technology; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D001688:Biological Products